Single scattering of electromagnetic waves by particles has been studied for more than a century. Although, our knowledge on the nature of this phenomena and its mathematical solution is 
Rigorous calculation of scattering by non-spherical particles such as aeorosol
Fractal aggregates of spherical monomers are very good approximation to many different types of  planetary aerosols including Titan's and Pluto's haze particles, some aeorols found in Jupiter, black and brown carbon in Earth's atmosphere, as well as interstellar, interplanetary and cometary dust particles.